Fish Quiz

[TallTree01]

I think this question is undoable as I imagine that most API tubes are different full volume.
So many great responses though... Hard for origonal questioner to pick a winner. ( hint me )

 

[Fishmanic]

I did it mathematically using a mm ruler.   I measured from top of line to top of tube 36mm.   Then measured bottom of tube to the line and got 45mm.   Divide 36 by 45.   Then multiply by 5 and then add 5.  I came up with 8.7 rounded off to the nearest tenth.
 
This is a hard one to award as I don't know if my method is accurate due to the line possibly not being 5 ml.  I wish I could give 3 people wins---but only one can win.   
 
Since TTA responded first and used a viable graduated measuring tube,  I will award him the WIN.   But I must say, you other responders used thoughtful  analyzing by various methods to get close to the actual volume.  
 
You're up TTA.  

 

[eaglesaquarium]

As a science teacher, I've got to say I LOVE the answers given for how they determined the total volume of the tube. 

 

[TwoTankAmin]

Before asking the next Q I would like to point out the reason that one cannot simply use a ruler to measure the height of the test tube and then go from there. How much allowance do you build in for the thickness of the glass at the bottom of the tube? Its like calculating tank volume in the USA where the manufacturers measure the outside of the glass to do so. But the water that would fit in the tank is actually based on the inside dimensions. To calculate the proper answer here, if one could trust the volume line, requires a ruler that fits inside of the tube.
 
Now, in the continental U.S., what is the rarest and most endangered fw fish?

 

[Ch4rlie]

There is a little bell ringing in my head somewhere, and for some reason am thinking of darters.
 
Candy Darter?

 

[Fishmanic]

the Diamond Darter

 

[eaglesaquarium]

Before asking the next Q I would like to point out the reason that one cannot simply use a ruler to measure the height of the test tube and then go from there. How much allowance do you build in for the thickness of the glass at the bottom of the tube? Its like calculating tank volume in the USA where the manufacturers measure the outside of the glass to do so. But the water that would fit in the tank is actually based on the inside dimensions. To calculate the proper answer here, if one could trust the volume line, requires a ruler that fits inside of the tube.
 
Now, in the continental U.S., what is the rarest and most endangered fw fish?

 
An excellent answer TTA.  It is very true, and to get to a finer point still, the issue of the 'uniformity' of the cylinder also comes into play.  How does one deal with the meniscus at the top?  Generally when dealing with water, you would read the bottom of the meniscus, but once it reaches the top of the container, the meniscus can actually become convex, rather than concave... meaning it actually would hold MORE water than just the volume of the cylinder.  
 
Ah... great discussions!

 

[daizeUK]

Before asking the next Q I would like to point out the reason that one cannot simply use a ruler to measure the height of the test tube and then go from there. How much allowance do you build in for the thickness of the glass at the bottom of the tube? Its like calculating tank volume in the USA where the manufacturers measure the outside of the glass to do so. But the water that would fit in the tank is actually based on the inside dimensions. To calculate the proper answer here, if one could trust the volume line, requires a ruler that fits inside of the tube.

 
The difference is that I did calculate on inside dimensions with the possible exception of the base which is fairly negligible compared to the overall volume of the cylinder.  The thickness of the glass is approx 1mm so the volume of water that can fit in a space 1mm tall by 11mm diameter is 0.095 cm cubed.
 
If you like you I can modify my answer to 7.93 ml  +/- 0.05 ml accuracy.  Is that better?

 

[TwoTankAmin]

1st- nope to the darters mentioned. But I will start to give hints. #1 this fish is only found in one place.
 
2nd. daize, I wasn't the one who wanted the answer w/i .1 ml, don't blame me. My point was simply that measuring the outside of the tube was not accurate as the bottom glass was likely close to .1 ml perhaps. I did not address either of the issues eagle so rightly added.

 

[Ch4rlie]

Aha,  Devil's Hole Pupfish

 

[TwoTankAmin]

Correct- and now for the neat facts about this.
 
Devils Hole pupfish is one of the world’s rarest fishes, spending most of its life in the top 80 feet of the 93 degree waters of cavern in the middle of the Mojave Desert. Its habitat is one of the smallest natural ranges known for any vertebrate. 

Devils Hole is an extreme environment, with water temperatures and dissolved oxygen concentrations near their lethal limits for fish. It is thought this fish has survived and adapted to these harsh conditions for thousands of years.
 
All the amazing information about this fish and efforts to save it from extinction can be found here http/www.fws.gov/nevada/protected_species/fish/species/dhp/dhp.html

 

[Ch4rlie]

Yaay!
 
My very simple question is this :
 
Where is a fish's caudal fin?

 

[Fishmanic]

Twenty five years ago, this contest wouldn't work without the powers of widespread use of google and the internet.  Nowadays, anyone can seem smart due to computers.

 

[Fishmanic]

the caudal fin is the tail fin of a fish located at the end of the fish--used for fish to move through the water

 

[Ch4rlie]

FM, perfect answer
 
Your turn!